Now sorted thanks all.

Thanks for the reply @Kevin_Z App version is 1.9.4 running on Android 9 (Samsung Galaxy s10+). Topology: 1 x M5 connected to Modem, 2 remote with Ethernet backhaul. They were all running the latest...

I have changed phones & am simply trying to reconnect the Deco app to the existing WiFi mesh (using 3 x M5s). The app seems to want to set up everything again from scratch and I do not want to break...